Does this mean you are actually lending the book for a period of time? (goodereader.com)
These lending sites help boost the amount of sharing going on from user to user, and don't forget libraries also lend books out directly. (goodereader.com)
The first criteria I looked for was the ability to lend books from libraries and to be able to lend & loan books from other people with e-readers. (lindacassidylewis.com)